1. Department for Surgery, Regional Hospital Belp, Switzerland
2. Dr. Brill + Partner GmbH, Institute for Hygiene and Mikrobiologie, Hamburg, Germany
3. Timaru Hospital, South Canterbury, DHB, New Zealand
4. University Medicine Greifswald, Institute of Hygiene and Environmental Medicine, Greifswald, Germany
5. Institute of Skin Integrity and Infection Prevention, School of Human & Health Sciences, University of Huddersfield, UK